Vpliv temperaturnih sprememb na nekatere mehanske in optične lastnosti odtisov s kapljičnim tiskalnikom

Šraj, Maša (author), Bračko, Sabina (mentor)

Namen magistrske naloge je bil ugotoviti, kakšen vpliv imajo temperaturne spremembe in čas izpostavljenosti temperaturnim spremembam na mehansko obstojnost odtisov in belino, ter barvni odtenek beline papirja. Preučevani so bili odtisi, natisnjeni na dve vrsti papirja (mat in sijajni premaz) s kapljičnim tiskalnikom. Raziskava je obsegala oblikovanje merske tablice, na kateri je bilo osem barvnih polj s štirimi barvami (CMYK). Vsaka barva je bila prikazana s 100% in 50% pokritostjo. Odtisi so bili izpostavljeni različnim temperaturnim spremembam (-12 °C, 6 °C, sobna temperatura, izmenična temperatura med sobno in 6 °C) za tri časovna obdobja. Časovni intervali so bili dolgi po šest dni (6, 12 in 18 dni). Po vsakem intervalu je bila preverjena obstojnost vzorcev na drgnjenje, belino papirja in barvni odtenek beline papirja. Barvne razlike so bile izračunane iz izmerjenih spektrofotometričnih vrednosti na vzorcih. Ugotovljeno je bilo, da vrsta papirja in njegovega premaza vpliva na končno mehansko obstojnost odtisov, ki so bili izpostavljeni temperaturnim spremembam. V splošnem je imel papir 2 (mat premaz) veliko bolj konsistentne rezultate in vzorci tega papirja kažejo večinoma boljšo obstojnost na drgnjenje, kot tisti na papirju 1 (sijajni premaz). Iz rezultatov je razvidno, da je izpostavljenost temperaturnim spremembam vplivala na obstojnost odtisov na drgnjenje. Na papirju, ki je bil premazan z sijajnim premazom (papir 1), so bile zaznane večje barvne razlike v primerjavi z mat premazom (papir 2). V povprečju so imeli odtisi na papirju 1 največje barvne razlike po 12 dneh in odtisi na papirju 2 po šestih dneh izpostavljenosti temperaturnim spremembam. Belina papirja in barvni odtenek beline sta se po določenem času izpostavljenosti le minimalno spremenila in sprememb zelo verjetno ne bi mogli zaznati s prostim očesom.

• Language: Slovenian
• Keywords: kapljični tisk, temperatura, mehanska obstojnost, belina papirja, barvni odtis
• Work type: Master's thesis/paper
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Year: 2022
• PID: 20.500.12556/RUL-136434
• Publication date in RUL: 04.05.2022

Secondary language

• Language: English
• Title: Impact of temperature changes on some mechanical and optical properties of prints made with inkjet printing

Abstract

The main aim of the study was to determine the effect of temperature changes and its time of exposure on the mechanical stability of prints, paper whiteness, and tint of whiteness. Imprints were printed with inkjet printer on two types of coated paper (matt and glossy). The research included the design of pattern, which was printed. It included eight color fields with four colors (CMYK). Each color was displayed with 100% and 50% coverage. Imprints were exposed to different temperatures (-12 °C, 6 °C, room temperature, alternating temperature between room temperature and 6 °C) for three time periods. The time intervals were six days long (6, 12, and 18 days). After each interval, we checked the abrasion stability of the samples, whiteness of the paper, and the tint of whiteness. Color differences were calculated from the measured spectrophotometric values of the samples. The results showed that the type of paper and its coating affects the final mechanical stability of prints that were exposed to temperature changes. In general, paper 2 (matt coating) has much more consistent results and prints of this paper mostly show better abrasion resistance than those on paper 1 (glossy coating). The results show that exposure to temperature changes affects the mechanical stability of prints. Larger color differences were detected on glossy coated paper (paper 1) compared to matt coating (paper 2). On average, prints on paper 1 had the largest color differences after 12 days of exposure and prints on paper 2 after six days of exposure to temperature changes. The whiteness of the paper and the tint of whiteness had minimal changes with exposure time that cannot be detected with the naked eye.

• Keywords: inkjet printing, temperature, mechanical stability, paper whiteness, color print